1 /* $NetBSD: pic_splfuncs.c,v 1.24 2022/06/25 13:24:35 jmcneill Exp $ */ 2 /*- 3 * Copyright (c) 2008 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Matt Thomas. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "opt_modular.h" 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.24 2022/06/25 13:24:35 jmcneill Exp $"); 35 36 #define _INTR_PRIVATE 37 #include <sys/param.h> 38 #include <sys/atomic.h> 39 #include <sys/evcnt.h> 40 #include <sys/lwp.h> 41 #include <sys/kernel.h> 42 43 #include <dev/cons.h> 44 45 #include <arm/armreg.h> 46 #include <arm/cpu.h> 47 #include <arm/cpufunc.h> 48 #include <arm/locore.h> /* for compat aarch64 */ 49 50 #include <arm/pic/picvar.h> 51 52 int 53 _splraise(int newipl) 54 { 55 struct cpu_info * const ci = curcpu(); 56 const int oldipl = ci->ci_cpl; 57 KASSERT(newipl < NIPL); 58 if (newipl > ci->ci_cpl) { 59 pic_set_priority(ci, newipl); 60 } 61 return oldipl; 62 } 63 64 int 65 _spllower(int newipl) 66 { 67 struct cpu_info * const ci = curcpu(); 68 const int oldipl = ci->ci_cpl; 69 KASSERT(panicstr || newipl <= ci->ci_cpl); 70 if (newipl < ci->ci_cpl) { 71 register_t psw = DISABLE_INTERRUPT_SAVE(); 72 ci->ci_intr_depth++; 73 pic_do_pending_ints(psw, newipl, NULL); 74 ci->ci_intr_depth--; 75 if ((psw & I32_bit) == 0 || newipl == IPL_NONE) 76 ENABLE_INTERRUPT(); 77 cpu_dosoftints(); 78 } 79 return oldipl; 80 } 81 82 void 83 splx(int savedipl) 84 { 85 struct cpu_info * const ci = curcpu(); 86 KASSERT(savedipl < NIPL); 87 88 if (__predict_false(savedipl == ci->ci_cpl)) { 89 return; 90 } 91 92 if (ci->ci_cpl >= IPL_VM) { 93 register_t psw = DISABLE_INTERRUPT_SAVE(); 94 KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl, 95 "splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl); 96 97 ci->ci_intr_depth++; 98 pic_do_pending_ints(psw, savedipl, NULL); 99 ci->ci_intr_depth--; 100 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 101 ci->ci_cpl, savedipl); 102 if ((psw & I32_bit) == 0) 103 ENABLE_INTERRUPT(); 104 } else { 105 pic_set_priority(ci, savedipl); 106 } 107 108 cpu_dosoftints(); 109 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 110 ci->ci_cpl, savedipl); 111 } 112